I'm having almost 60-70% CPU utilization on a 6500 core for almost a day now. However cant seem to figure out what is overwhelming the CPU utlization. show cpu process sorted does not provide much information with top two processes being 'slcp process' - about 2-3% & spanning tree process which goes between 1-2%. The major change in the network was introduction of Nexus 2232 (10G) switches in the DC which are connected to 5K with 20 Gb uplinks to the 6500. Now almost 20 servers are connected to this switch, but none of them are going beyond 1.5 Gb/s.
Connecting 5ks to 6500 should not cause high CPU. Usually, when 6500s are configured in VSS mode, the CPU runs higher. Also if you are running a modular code, the CPU usually runs higher. Note that most newer IOS verions are not modular more .
Also, have a look at this doc for tips on troubleshooting high CPU.
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